/*
 * ------------------------------------------------------------------------
 *  Copyright by KNIME AG, Zurich, Switzerland
 *  Website: http://www.knime.com; Email: contact@knime.com
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License, Version 3, as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, see <http://www.gnu.org/licenses>.
 *
 *  Additional permission under GNU GPL version 3 section 7:
 *
 *  KNIME interoperates with ECLIPSE solely via ECLIPSE's plug-in APIs.
 *  Hence, KNIME and ECLIPSE are both independent programs and are not
 *  derived from each other. Should, however, the interpretation of the
 *  GNU GPL Version 3 ("License") under any applicable laws result in
 *  KNIME and ECLIPSE being a combined program, KNIME AG herewith grants
 *  you the additional permission to use and propagate KNIME together with
 *  ECLIPSE with only the license terms in place for ECLIPSE applying to
 *  ECLIPSE and the GNU GPL Version 3 applying for KNIME, provided the
 *  license terms of ECLIPSE themselves allow for the respective use and
 *  propagation of ECLIPSE together with KNIME.
 *
 *  Additional permission relating to nodes for KNIME that extend the Node
 *  Extension (and in particular that are based on subclasses of NodeModel,
 *  NodeDialog, and NodeView) and that only interoperate with KNIME through
 *  standard APIs ("Nodes"):
 *  Nodes are deemed to be separate and independent programs and to not be
 *  covered works.  Notwithstanding anything to the contrary in the
 *  License, the License does not apply to Nodes, you are not required to
 *  license Nodes under the License, and you are granted a license to
 *  prepare and propagate Nodes, in each case even if such Nodes are
 *  propagated with or for interoperation with KNIME.  The owner of a Node
 *  may freely choose the license terms applicable to such Node, including
 *  when such Node is propagated with or for interoperation with KNIME.
 * ------------------------------------------------------------------------
 */

package org.knime.base.data.filter.row.dialog.component.tree.model;

import java.util.Arrays;

import org.knime.base.data.filter.row.dialog.model.ColumnSpec;
import org.knime.base.data.filter.row.dialog.model.Condition;
import org.knime.base.data.filter.row.dialog.model.Operation;
import org.knime.base.data.filter.row.dialog.model.Operator;

/**
 * View object to show a condition in the element tree.
 *
 * @author Viktor Buria
 */
public class TreeCondition extends TreeElement<Condition> {

    private static final String SPACER = " ";

    /**
     * Constructs a {@link TreeCondition} object.
     *
     * @param condition the {@link Condition}
     */
    public TreeCondition(final Condition condition) {
        super(condition);
    }

    @Override
    public String toString() {
        final ColumnSpec spec = getValue().getColumnSpec();
        if (spec != null) {
            return toStringWithSpec(spec);
        } else {
            return "Condition #" + getValue().getId();
        }
    }

    private String toStringWithSpec(final ColumnSpec spec) {
        final StringBuilder builder = new StringBuilder();
        builder.append(spec.getName());

        final Operation operation = getValue().getOperation();
        if (operation != null) {
            appendOperation(builder, operation);
        }
        return builder.toString();
    }

    private static void appendOperation(final StringBuilder builder, final Operation operation) {
        final Operator operator = operation.getOperator();
        if (operator != null) {
            appendOperator(builder, operator);
        }
        final String[] operands = operation.getValues();
        if (operands != null && operands.length > 0) {
            appendOperands(builder, operands);
        }
    }

    private static void appendOperator(final StringBuilder builder, final Operator operator) {
        builder.append(SPACER).append(operator.getName());
    }

    private static void appendOperands(final StringBuilder builder, final String[] operands) {
        if (operands.length > 1) {
            builder.append(SPACER).append(Arrays.toString(operands));
        } else {
            builder.append(SPACER).append(operands[0]);
        }
    }

}
